Re: [whatwg/fullscreen] Ending fullscreen for popups (#116)

To answer questions:

Why not Safari's behavior? Because it relies on the way the Mac does fullscreen. When a Mac app goes fullscreen, it moves to its own space, apart from other windows. Other operating systems do not function in this way. Therefore, we can't align on that behavior because we can't have the spec relying on a platform-specific behavior.

Why not Firefox's behavior? It has the same security issue that Chrome has, with a popup overlaying the fullscreen page. In addition, it's inconsistent. A page cannot overlay a popup onto a fullscreen page by opening the popup, but if the page creates the popup and *then* focuses it, it can achieve that goal?

The Edge behavior wins by being consistent and simple.

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